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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 329674 $ -->
<refentry xml:id="function.is-numeric" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>is_numeric</refname>
<refpurpose>
Finds whether a variable is a number or a numeric string
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_numeric</methodname>
<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
</methodsynopsis>
<para>
Finds whether the given variable is numeric. Numeric strings consist of optional
sign, any number of digits, optional decimal part and optional exponential part.
Thus <literal>+0123.45e6</literal> is a valid numeric value. Hexadecimal (e.g.
<literal>0xf4c3b00c</literal>), Binary (e.g. <literal>0b10100111001</literal>),
Octal (e.g. <literal>0777</literal>) notation is allowed too but only without
sign, decimal and exponential part.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>var</parameter></term>
<listitem>
<para>
The variable being evaluated.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns &true; if <parameter>var</parameter> is a number or a numeric
string, &false; otherwise.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>is_numeric</function> examples</title>
<programlisting role="php">
<![CDATA[
<?php
$tests = array(
"42",
1337,
0x539,
02471,
0b10100111001,
1337e0,
"not numeric",
array(),
9.1
);
foreach ($tests as $element) {
if (is_numeric($element)) {
echo "'{$element}' is numeric", PHP_EOL;
} else {
echo "'{$element}' is NOT numeric", PHP_EOL;
}
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
'42' is numeric
'1337' is numeric
'1337' is numeric
'1337' is numeric
'1337' is numeric
'1337' is numeric
'not numeric' is NOT numeric
'Array' is NOT numeric
'9.1' is numeric
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ctype_digit</function></member>
<member><function>is_bool</function></member>
<member><function>is_null</function></member>
<member><function>is_float</function></member>
<member><function>is_int</function></member>
<member><function>is_string</function></member>
<member><function>is_object</function></member>
<member><function>is_array</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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